Add token budget enforcement and usage tracking
Token Budget System:
- ThreadBudgetRegistry tracks per-thread token usage with configurable limits
- BudgetExhaustedError raised when thread exceeds max_tokens_per_thread
- Integrates with LLMRouter to block LLM calls when budget exhausted
- Automatic cleanup when threads are pruned
Usage Tracking (for production billing):
- UsageTracker emits events after each LLM completion
- Subscribers receive UsageEvent with tokens, latency, estimated cost
- Cost estimation for common models (Grok, Claude, GPT, etc.)
- Aggregate stats by agent, model, and totals
Configuration:
- max_tokens_per_thread in organism.yaml (default 100k)
- LLMRouter.complete() accepts thread_id and metadata parameters
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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